White-browed Brushfinch

The white-browed brushfinch is about 19 cm (7.5 in) long and weighs 30 to 36 g (1.1 to 1.3 oz). The sexes have the same plumage. Adults of the nominate subspecies have a black crown with a gray stripe in the middle. They have black lores and blackish ear coverts. A stripe of white that begins over the lores and continues as a supercilium to the nape gives the species its eponymous white brow. Their upperparts, wings, and tail are olive. Their throat is white with a black band below it. Their breast and belly are whitish or pale gray and their flanks are gray with an olive tinge. Juveniles have a sootier head than adults, no black chest band, a pale gray breast, and a buff belly. Subspecies A. t. fimbriatus is similar to the nominate but its white facial stripe begins further to the rear. A. t. borellii is like finbriatus but without the black chest band. All subspecies have a dark brown iris, a blackish bill, and pinkish brown to grayish legs and feet.

The nominate subspecies of the white-browed brushfinch is the northernmost. It is found from Puno Department in far southeastern Peru into western Bolivia as far as western Cochabamba Department. Subspecies A. t. fimbriatus is found in Bolivia in eastern Cochabamba, western Santa Cruz, and Chuquisaca departments. A. t. borellii is found from Chuquisaca and Tarija departments in southern Bolivia south into northwestern Argentina's Jujuy and Salta provinces. The species primarily inhabits the understory and edges of montane evergreen forest both primary and secondary, and to a lesser extent elfin forest. The nominate subspecies ranges in elevation from 1,650 to 3,100 m (5,400 to 10,200 ft) and the other two subspecies from 400 to 1,200 m (1,300 to 3,900 ft).

The white-browed brushfinch's diet has not been studied but is known to include insects, seeds, and fruit. It forages singly and in pairs. It forages on the ground or in low vegetation, flipping leaf litter with its bill.